$$(\frac{1}{81}-\frac{1}{16})^{-1}$$
$-\frac{1296}{65}\approx -19.938461538$
$$\left(-\frac{65}{1296}\right)^{-1}$$
$$-\frac{1296}{65}$$
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$-\frac{1296}{65} = -19\frac{61}{65} = -19.93846153846154$
